STMicroelectronics STEVAL-MKI139V1

Overview

STEVAL-MKI139V1 from STMicroelectronics is a microphone coupon evaluation board hosting four MP33AB01 analog MEMS microphones, designed for rapid acoustic performance validation in compact audio front-ends. It operates from 1.5 V to 3.6 V, delivers 63 dB SNR, features 125 dBSPL acoustic overload point, -38 dBFV sensitivity, and 100 Hz–10 kHz frequency response.

For engineers reviewing the STEVAL-MKI139V1 datasheet, STEVAL-MKI139V1 pinout, STEVAL-MKI139V1 application, or STEVAL-MKI139V1 equivalent, key selection considerations include coupon-based detachable PCB layout, bottom-port analog MEMS microphone integration, supply voltage flexibility, and SNR/THD performance at 94 dBSPL.

Technical Context

The board implements four independent MP33AB01 analog MEMS microphone units on individual coupon-style sub-PCBs, each with dedicated biasing and output routing. Each microphone provides single-ended analog output, requires no external clock, and uses internal bias circuitry compatible with 1.5–3.6 V supply rails.

Designed for acoustic characterization and comparative testing, the board supports simultaneous multi-microphone evaluation without shared signal path interference. The coupon architecture enables physical separation of individual microphones for placement in varied acoustic environments or mechanical configurations.

Key Specifications

Availability

STEVAL-MKI139V1 is available at Aetrix Electronics and suitable for voice interface prototyping, far-field microphone array development, and MEMS microphone acoustic benchmarking requiring stable component supply and repeatable test conditions.

Supply support for STEVAL-MKI139V1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in microcontrollers, sensors, power management, and analog ICs for industrial, automotive, and consumer applications.

The STEVAL evaluation board series targets rapid device validation and system-level integration, with the MKI139V1 specifically developed to accelerate analog MEMS microphone evaluation in compact, modular form factors.

FAQ

What is the primary purpose of the STEVAL-MKI139V1 board?

The STEVAL-MKI139V1 is a microphone coupon evaluation board containing four detachable MP33AB01 analog MEMS microphones. Its purpose is to enable rapid acoustic performance testing, comparative analysis, and mechanical integration validation without full system assembly. Each coupon can be physically separated for individual placement or measurement.

Does the board require external clocking or digital configuration?

No. The MP33AB01 microphones on the STEVAL-MKI139V1 are analog-output devices with integrated bias circuitry and require no external clock, I²C, or SPI configuration. They operate as self-contained analog transducers powered only by a DC supply rail between 1.5 V and 3.6 V.

Can the STEVAL-MKI139V1 be used for beamforming or array processing?

Yes - the board's four spatially separated, electrically isolated microphones provide synchronized analog outputs suitable for basic beamforming algorithm development and phase-coherent signal acquisition. However, it lacks onboard ADC or digital synchronization logic, so external sampling hardware is required for time-aligned digitization.

Is the STEVAL-MKI139V1 RoHS compliant and suitable for commercial prototyping?

Yes. The board and all MP33AB01 microphones are RoHS compliant per the ST data brief. It is intended for commercial-grade prototyping and lab evaluation, not safety-critical, automotive, or medical applications - consistent with ST's stated usage restrictions in the official documentation.